Gold or gold-inlaid tablets. Jade carving line filling refers to gold filling, that is, flat coating gold on the concave bottom of the carved pattern or filling it with gold sheet and sticking gold foil, so that the pattern reveals golden lines and increases the elegance of the ornaments. Jade is a mineral. There are two kinds of jade: soft and hard. Usually, jade refers to nephrite. It belongs to one of the most common jewels.